Clutch and method of manufacturing rotor thereof

A friction clutch to which a motive force of a drive source is transmitted via a torque transmitter and from which the motive force is intermittently transmitted to a driven device, comprising:

• a rotor having a drive side clutch plate and a cylindrical outer wall extending axially from the drive side clutch plate, which are integrally formed into a single piece, the outer wall being to be engaged with and rotatably driven by the torque transmitter;
• and
• a driven side clutch plate to be connected with the driven device and movable axially so as to be frictionally engaged with and rotated together with the drive side clutch plate,
• wherein the drive side clutch plate is provided with a depression formed by compressing and plastically press deforming a part of an axial end surface of the drive side clutch plate positioned on an opposite side to the outer wall with respect to the drive side clutch plate.